SQL Server 中锁表查询操作

--查询是否存在阻塞信息
select bl.spid blocking_session,bl.blocked blocked_session,st.text blockedtext from (SELECT   spid ,blocked
   FROM (SELECT * FROM sys.sysprocesses WHERE   blocked>0 ) a 
   WHERE not exists(SELECT * 
                    FROM (SELECT * 
                          FROM sys.sysprocesses 
                          WHERE   blocked>0 ) b 
                    WHERE a.blocked=spid)
   union SELECT spid,blocked 
         FROM sys.sysprocesses 
         WHERE   blocked>0) bl,(SELECT t.text ,c.session_id 
         FROM sys.dm_exec_connections c  
         CROSS APPLY sys.dm_exec_sql_text (c.most_recent_sql_handle) t) st
 where bl.blocked = st.session_id
 
 --查询阻塞信息中主题
 select bl.spid blocking_session,bl.blocked blocked_session,st.text blockedtext,sb.text blockingtext 
from 
(SELECT   spid ,blocked
   FROM (SELECT * FROM sys.sysprocesses WHERE   blocked>0 ) a 
   WHERE not exists(SELECT * 
                    FROM (SELECT * 
                          FROM sys.sysprocesses 
                          WHERE   blocked>0 ) b 
                    WHERE a.blocked=spid)
   union 
 SELECT spid,blocked 
         FROM sys.sysprocesses 
         WHERE   blocked>0) bl,
(SELECT t.text ,c.session_id 
         FROM sys.dm_exec_connections c  
         CROSS APPLY sys.dm_exec_sql_text (c.most_recent_sql_handle) t) st,
(SELECT t.text ,c.session_id 
         FROM sys.dm_exec_connections c  
         CROSS APPLY sys.dm_exec_sql_text (c.most_recent_sql_handle) t) sb
 where bl.blocked = st.session_id and bl.spid = sb.session_id
 
 --查询表进程死锁情况
 select *
   from master..SysProcesses
  where db_Name(dbID) = 'EFINTERFACE'
    and spId <> @@SpId
    and dbID <> 0
    and blocked >0;